N,C=map(int,input().split())
L=list(map(int,input().split()))
W=list(map(int,input().split()))

def calc(a,b,cost):
    ANS=0
    if a==b==0:
        for i in range(N):
            if W[i]<=cost:
                ANS=max(ANS,L[i]+calc(0,L[i],cost-W[i]))

        return ANS

    if a==0:
        for i in range(N):
            if L[i]!=b and W[i]<=cost:
                ANS=max(ANS,L[i]+calc(b,L[i],cost-W[i]))

        return ANS

    if a<b:
        for i in range(N):
            if W[i]<=cost and L[i]<b and L[i]!=a:
                ANS=max(ANS,L[i]+calc(b,L[i],cost-W[i]))
        return ANS
    else:
        for i in range(N):
            if W[i]<=cost and L[i]>b and L[i]!=a:
                ANS=max(ANS,L[i]+calc(b,L[i],cost-W[i]))
        return ANS

if len(set(sorted(L)))<=2:
    print(0)
else:
    print(calc(0,0,C))